Ammonite Pairs

$10.00

Ammonites were a group of cephalopods that arose around 400 million years ago and went extinct at the end of the cretaceous, roughly 64 million years ago. Ammonites had external shells that grew along with their bodies. When they died, these shells were left behind to fossilize. Each order of an ammonite pair includes one shell that has been cut in half and polished to show how the shell fossilized. Mineralization of the empty chambers left behind as the animal grew leaves behind a crystalline interplay between biological and chemical structures that is unique to every fossil. We have two sizes of ammonite pair, small and medium. The small ones are 1.1 cm in diameter while the medium fossils are 3.3 cm